Non-linear Finite Element Restorative Analysis of Low Shear Resistant RC Beams Strengthened with Bio-Sisal and GFRP

Restoration is strengthening of structural components to its original strength characteristics or with an even better strength characteristic. Damaging events such as earthquakes incepts various degradation processes in structures, restoration aids in making the structures overcome these damaging effects and enhances its characteristics thereby leading to structural life enhancement. Non-linear finite element method (NLFEM) is a mathematical tool by means of which various strengthening or restorative methodologies can be evaluated through virtual platform and thus it results in economic savings and aids in decision making before actually being implemented with accuracy and optimization in the field works. In this paper the restorative analysis by means of NLFEM is carried out for evaluating the restorative potential of sisal fibre made fibre reinforced polymer (FRP) and a comparative analysis with that of GFRP has been done, in enhancing the shear resistance of RC beams (designed for shear-oriented failure) with these respective bonded FRPs. Sisal fibres have huge environmental positive contributing factors over artificially fabricated glass fibres and its composites, as glass is mainly obtained from silica, which is again obtained from non-renewable resources. Concrete crushing parameter alongside concrete cracking parameters, small deflection, static analysis with appropriate boundary conditions, and suitable sub-steps were all considered in the NLFEM analysis of bio-sisal FRP affixed RC beam and also the GFRP affixed RC beam. FRP composite and RC beam affixation was virtually designed buy using contact elements. The results obtained demonstrated huge potential in shear resistance enhancements in RC beams using both sisal FRP and GFRP affixation process. The paper ended with a recommendation to practicing engineering for utilizing natural sustainable bio based FRPs over artificial ones for restorative purpose.